In some embodiments, a display device includes a content receiving circuit configured to receive a content signal, a screen configured to display the content signal, a communication interface configured to communicate with other devices via a communication network, a memory storing one or more instructions, and a processor configured to execute the one or more instructions to obtain, from a user, a chatting channel establishment request and counterpart information for establishing a chatting channel; to identify a counterpart display device based on the counterpart information; to obtain an availability state of a chatting counterpart on the counterpart display device; and to perform real-time chatting or non-real-time chatting between the user and the chatting counterpart on the counterpart display device, based on a determination of whether the availability state of the chatting counterpart on the counterpart display device allows the real-time chatting or the non-real-time chatting.